Stop the timer. On the millisecond.
TimerBattle is a free timer game that tests your reaction time and timing. A target appears, the clock runs, and you stop it as close to the target as you can, right in your browser. Thousands of rounds in, only a few dozen were stopped at exactly 0 ms.
Press START, then stop the timer as close to the target as you can.
What is a reaction time game?
A reaction time game measures how quickly and how precisely you respond to a stimulus. In TimerBattle the stimulus is time itself: you stop a running timer as close as possible to a target between 2 and 6 seconds. The smaller the gap in milliseconds, the better the grade, so timing accuracy and reflex control are the skills that count.
- 01See the target. A random time between 2 and 6 seconds, for example 3.385.
- 02Start the timer. Tap. A ring fills toward the target, then fades, so you have to feel the rest.
- 03Stop it. Tap again. Early or late, the gap in milliseconds sets your grade and your points.
How the timer game is scored
Every round lands somewhere on this line.
The closer to the middle, the better the grade. Points per round: 100 × (1 − miss ÷ 250 ms). The percentages are how often our players land in each zone.
Game modes: solo, daily and 1v1 online
One tap. Six ways to play it.
From solo reflex training to a live reflex game online. Screens from the app as it is today, same game on the web, iOS and Android.
01Quick game
Five rounds, random targets. The fastest way to test your reaction time.
02Daily challenge
Same five targets for everyone, one attempt, a streak to keep.
03Survival
The hit window shrinks every five rounds. Perfects buy shields.
041v1 duels
A live reflex game online against a real player. Closer takes the round.
05Rankings
Daily ranking, weekly championship and leagues.
06Two on one phone
A two-player reflex game face to face on one screen. No internet needed.Reaction time data from real players
What thousands of rounds taught us.
We looked at every daily challenge and championship round our players have played. Three things stood out.
- 01Longer targets aren’t harder while you can see the clock: 109–118 ms at every length from 2 to 6 seconds.
- 02Short targets run late, long ones early. On 5-second targets 55% of stops come too soon.
- 03Your first round is your worst. In the daily challenge it misses by 126 ms, the rest by 113–121.
Median miss in ms. Part of the drop is selection: players who are good at it keep playing.
Reflex training that feels like a game.
TimerBattle works as a reaction time trainer: a few rounds a day, a clear number after every tap, and a typical miss you can watch shrink. Players who kept at it missed about 30% less by games five to ten, with most of the gain early.
Take the 5-click reaction time test →Why train reaction time?
Daily challenge and weekly leagues
Same five targets for everyone. One attempt.
Share your grid, keep your streak. Miss a day and a streak shield covers it: you earn one every seven days.
Play today’s challengeTwenty players. Seven days. Top three move up.
Play on web, iPhone and Android.
The same reaction time game in your browser and as a mobile app. Sign in and your stats, streak and rank follow you to every device.
TimerBattle Pro. No ads, your own colours and a gold dial. One payment, no subscription.
Get Pro · $3.99Guides to reaction time and timing
View all posts →Frequently asked questions
Is TimerBattle free?
Yes. Every mode is free on the web, iOS and Android. Pro only removes ads and adds cosmetics.
Do I need an account?
No. Sign in only to keep your stats, appear in rankings and join a league.
How is a round scored?
By how far you stop from the target: 20 ms or closer is Perfect, more than 250 ms is a Miss. Points per round: 100 × (1 − miss ÷ 250 ms).
Can I play with friends?
Live 1v1 online, two players on one phone, or a challenge link they can open without an account.
Can I play offline?
Yes. Practice and custom games, and two players on one phone, work without internet. Online duels, the daily challenge and rankings need a connection.
Can TimerBattle improve my reaction time?
It trains timing and reflex control. In our data, players missed about 30% less by games five to ten, with most of the gain in the first few games.